There's also Genera (in many ways the best but unfortunately still not widely available), Lispworks (commercial, lacks the features/userbase of Emacs) and a vast number of niche Lisp-based/Smalltalk-based/Forth-based environments that don't come close to the practicality of Emacs.
For all intents and purposes, Emacs is the 'best' freely available and most used Lisp machine we have today, a direct manifestation of Licklider's "Man-Computer Symbiosis".
The recent additions of sqlite3 and native compilation (MPS-based garbage collection is in the works) have significantly expanded the set of problems one can solve. I love Common Lisp but I barely touch it these days, as I tend to reach for Emacs Lisp instead. That's solely down to the evolution and practicality of Emacs.